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φ159×6无缝钢管(锅炉行业称集箱)缩口有两种方法:一是在管端焊接球形端盖;二是对管端进行热旋压。前者质量不易保证,后者应用设备复杂,投资较大。我厂试验研究成功一种胎模锻造新方法。基本原理如图1所示。把胎模固定在空气锤砧座上,上锻模2由弹簧6托起,将加热的钢管3放入胎模,并使钢管一端露出模具长25mm以上,然后开始锻打,同时转动钢管,锻打力由小到大逐步增加,经数分钟即可成形。
φ159 × 6 seamless steel pipe (boiler industry, said header) necking There are two ways: First, the spherical end of the tube welded end caps; the second is the hot end of the pipe spinning. The former is not easy to guarantee the quality of the latter application of complex equipment, large investment. I plant a successful test of a new type of tire forging method. The basic principle is shown in Figure 1. The tire mold is fixed on the air hammer anvil, the upper die 2 is lifted by the spring 6, the heated steel pipe 3 is put into the tire mold, and the one end of the steel pipe is exposed for more than 25mm long, then the forging is started and the steel pipe is rotated, Forging power gradually increased from small to large, after a few minutes to shape.